class_docstr: Base class for row group indexers.
docstr: Return unique index name.
docstr_tok: ["Return","unique","index","name","."]
code: def index_name(self):
      """Return unique index name."""
      return None
  
file_path: petastorm/petastorm/etl/__init__.py
imports: import abc
  import six
label_desc: Use image node_id 2 for calling the RowGroupIndexerBase obj's underlying member method code with example usage: obj.index_name() and returns: None